Hi Sanan, On Thu, Jan 26, 2023 at 12:58 AM Sanan Hasanov <sanan.hasanov@xxxxxxxxxxxxxxx> wrote: > We found a bug using a modified kernel configuration file used by syzbot. > > We enhanced the coverage of the configuration file using our tool, klocalizer. > > Kernel Branch: 6.2.0-rc5-next-20230124 > Kernel config: https://drive.google.com/file/d/1F-LszDAizEEH0ZX0HcSR06v5q8FPl2Uv/view?usp=sharing > Reproducer: https://drive.google.com/file/d/1mP1jcLBY7vWCNM60OMf-ogw-urQRjNrm/view?usp=sharing > > Thank you! > > Best regards, > Sanan Hasanov > > ================================================================================ > UBSAN: shift-out-of-bounds in drivers/video/fbdev/core/fbcon.c:2489:33 > shift exponent 35 is too large for 32-bit type 'int' This looks valid to me: con_font_set() checks the font width and height against max_font_width (64) and max_font_height (128), but fbcon has stricter limits. fbcon_set_font() should reject fonts with width > 32 or height > 32. Thanks! Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
